You don’t have to be young to be a triathlete. Witness the Tri-Umph! Classic, billed as the first national multisport event series for the 50-and-over set.

This baby-boomer triathlon – called “challenging but achievable” – consists of a quarter-mile swim, a 12.4-mile bike ride and a 3.1-mile run or walk.

The action takes place Sept. 23 at the Old Westbury, L.I., campus of the State University of New York. The $30 entry fee includes training; there’s also Web-based training at http://www.aarp.org/triumph. For more information, call (866) 812-AARP.

Free tests

Granted, it may not be on your calendar – but Prostate Cancer Awareness Week is just around the corner, and there are free screenings in the city.

From 10 a.m. to 2 p.m. on Sept. 25, a mobile unit will be parked outside the New York County Courthouse on Pearl Street.

The exam takes about 15 minutes and patients will receive results by mail in 10 days or so.

Appointments are required; call (800) 564-6868. For information about screenings elsewhere in Manhattan, and in Brooklyn, Queens and The Bronx, call (212) 628-9090.

Fast results

A new test for Lyme disease significantly reduces the waiting time for results – from about a week to 20 minutes.

The so-called “Western blot test” was developed by Dr. Raymond Dattwyler of Stony Brook University. “By decreasing the turnaround time for results, patients can begin treatment with antibiotics faster ,” Dattwyler says. Left untreated, Lyme can affect the skin, nervous system, heart and joints.